Dynamic IPv6 Address Assignment

IPv6 dynamic address assignment strategies allow dynamic assignment of IPv6 addresses, as follows:

■ Link-local address: The host configures its own link-local address autonomously, using the link-local prefix FE80::0/10 and a 64-bit identifier for the interface, in an EUI-64 format.

■ Stateless autoconfiguration: A router on the link advertises—either periodically or at the host's request—network information, such as the 64-bit prefix of the local network and its willingness to function as a default router for the link. Hosts can automatically generate their global IPv6 addresses by using the prefix in these router messages; the hosts do not need manual configuration or the help of a device such as a DHCP server. For example, Figure 6-21 shows a host using the prefix advertised by the router as the top 64 bits of its address; the remaining 64 bits contain the host's 48-bit MAC address in an EUI-64 format.

Figure 6-21 IPv6 Stateless Autoconfiguration Allows a Host to Automatically Configure Its IPv6 Address

Subnet Prefix + MAC Address

Figure 6-21 IPv6 Stateless Autoconfiguration Allows a Host to Automatically Configure Its IPv6 Address

Subnet Prefix + MAC Address

Subnet Prefix + MAC Address

(Single Subnet Scope, Formed from Reserved Prefix and Link Layer Address)

■ Stateful using DHCP for IPv6 (DHCPv6): DHCPv6 is an updated version of DHCP for IPv4. DHCPv6 gives the network administrator more control than stateless autoconfiguration and can be used to distribute other information, including the address of the DNS server. DHCPv6 can also be used for automatic domain name registration of hosts using a dynamic DNS server. DHCPv6 uses multicast addresses.

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